Driven by speculation that planet Earth's average temperature could rise as much as six degrees Celsius by the year 2100, the filmmakers at National Geographic speculate about the effects that each new degree would have on both mankind and the world we live in. By highlighting the effects of global warming on such areas as the Amazonian rainforests and the ice fields of Greenland, experts offer chilling insight into the possibility that man's constant quest for energy could ultimately bring about our downfall. After separating the facts from controversial speculation, the time comes to explore the means by which man could use technology and other methods to try and prevent the planet from overheating.